Plug cock



1. MARTIN, 1

PLUG COCK.

APPLICATION FILED FEB. 5. 1921.

Patented May 23, 1922.

F/Ez

JESSE CQIMARTHV, JR, OF SAN FRANCISCO,

PLUG- GOGKJ Application filed February :5, 1921.

To all whom it may concern:

Be it known that I, Jnssn C. MARTIN, J12, a citizen of the UnitedStates, and a resident of San Francisco, county of San Francisco, andState of California, have invented certain new and useful Improvementsin Plug Cocks.

The hereinafter described invention relates to closures in pipe linesfor stopping or throttling the fluid flow therethrough embodyingconstructive improvements over my United States Letters Patent No.1,365,116, entitled Plug cocks, issued January 11th, 1921.

One of the objects of the invention is to provide better means forintroducing the lubricant forced under high pressure between the plugand plug seat surfaces so that, after the lubricant is introducedthrough the ports provided for its movement, it will not pass back andwaste out of its inlet due to the pressure built u in the ports when itis forced in, it being esirable that this pressure, so far as possible,be retained in the lubricant ducts or passages so as to automaticallycontinue the lubricant advance tothe plug and plug seat surfaces.

after the grease gun is removed, and in the accomplishment of this, Iprovide a check valve controlled lubricant inlet which will prevent thelubricant exit therethrough after the high pressure grease gun isremoved.

A further object of the invention is to provide a diaphragm between theend of the plug and the plate aflixed to the casing which will form atight joint between the casing and plate, as well as a movable tightjoint between the diaphragm and the end of the plug, therebyefl'ectively serving to keep the lubricant pressure up within the valveby checking its passage in this direction, as well as stopping any fluidpressure escapement to the atmosphere by the end of the plug, theconstancy of the movable tight joint being assured by a resilient memberwhich presses the diaphragm against the joint surface on the plug,automatically compensating for any wear as well as eliminating the useof a gland an stufiing box which has to be periodically screwed up andrepacked, and owing to the inaccessible places where these valves areinstalled such packing is frequently neglected, detracting materiallyfrom the general efiiciency of the valve.

Specification of Letters Patent.

[9% WSUED Patented May 23, 11922. Serial No. 442,862.

For the purpose of better understanding the invention, reference ishereby made to the accompanying drawing, in which Fig. 1 is a verticalsection taken through the center of a plug cock of my improvedconstruction.

Fig. 2 is a horizontal section taken approximately on the line 2-2 ofFig.1.

Fig. 3 is a horizontal section taken approximately on the line 3-3 ofFig. 1.

Referring by numerals to the accompanying drawings, 10 designates thebody or casing of the cook, the same being provided with oppositelyarranged internally threaded tubular portions, 11, for pipe connections,and centrally arranged within the body or casing is a conical valveseat, 12.

Fitting snugly within the valve seat and adapted to rotate therein is aconical plug, 13, having a diametrically arranged opening, 14, that isadapted to register with the openings through the tubular members, 11,and formed integral with and projecting upwardly from the body of theplug is a short cylindrical stem, 15.

Projecting upwardl from the top of this stem, 15, is an externa lythreaded stem portion, 16, and projecting upwardly from the upper endthereof is a square or non-circular member, 17, that is adapted toreceive a valve operating member such as a hand lever or wrench.

Formed in the outer face of the body of plug 13, are diametricallyopposed vertically disposed grooves, 18, the lower ends of whichterminate in a plane slightly above the lower end of the plug. The upperends of these lubricant receiving grooves communicate with the ends of adiametrically arranged duct or passageway, 19, the latter being formedthrough the upper portion of the plug, 13, and this duct or passageway,19, intersects the lower end of an axially disposed duct or passageway,20, that is formed through stem, 15, threaded member, 16, and theangular terminal portion, 17, of the stem.

The ducts or passageways just described,

provide means for delivering lubricant, such as grease or heavy oil,directly to the conical valve seat, 12, and the external surface ofplug, 13, said lubricant being delivered into the upper end of duct orpassageway, 20, through the check valve, 21, by means of a grease gun,the lubricant being retained in the ducts or passageways after theremoval of the grease gun by the check valve, 21.

Grooves, 18, are disposed on thesurface of plug, 13, so that if saidplug is shlfted from closed to open position and v1 ce versa, saidpassages will at no time register or communicate with the openingsthrough the tubular portion, 11, of the valve housing thus holding thegrease or liquld lubricant effectually within said grooves, and as thelubricant is also kept from passing out of its inlet by the check valve,21, proper lubr cation to the plug and plug seat surfaces is assured atall times.

The top housing, 10, surrounding the eonlcal opening, 12, is providedwith a relatlvely fiat surface, 22, and positioned thereupon is theouter portion of a diaphragm, 23, that is perforated or provided with acentrally arranged opening for accommodatlon of the stem, 15.

Positioned immediately on top of diaphragm, .23, is a plate, 25, thesame belng secured to the casing, 10, in any sultable manner, preferablyby means of bolts or studs, 26, and nuts, 27, and formed 1n the centerof this plate is an opening, 28, for the accommodation of the stem, 15.

Formed on the under side of plate, 25, around the centrally arrangedopening therein is an annular recess, 29 Arranged within this recess andresting upon the inner edge of the diaphragm, 23, is an annular plate,30, provided adjacent to its inner edge with an upwardly projecting ribor flan e, 31, which latter serves as a bearing for t 1e inner loweredge of a resilient member, preferably a dished metal ring, 32.

\Vhen the parts of the cock are properly assembled and nuts, 27, aretightened to secure plate, 25, on housing, 10, the pressure on the outerupper edge of the resilient -pressure member, 32, imparts downwardpressure to ring or annular plate, 30, and this pressure is transmitteddirectly to the inner edge of the diaphragm, 23, and as a result amovable fluid pressure tightjoint is maintained between the innersurface of the diaphragm and the end of plug, 13. Diaphragm, 23, alsoprovides a joint between the plate, 25, and housing, 10.

The diaphragm, 23, may be constructed of any suitable material; forinstance, rubber, duck. asbestos, lead or copper, as best adaptable tothe character of service in which the valve is applied.

Formed in the upper portion of stem, 15, is a horizontally disposedarcuate slot or recess, 33, the length of which is slightly greater thanninety degrees, and projecting into said slot or recess from theadjacent inner edge of plate, 25, is a lug, 34.

The parts just described are arranged so that lug, 3f occupies aposition at one end of the slot or recess when the valve in fully closedposition, and when said valve is rotated a quarter of a turn into fullopen position, said lug is positioned in the opposite end of said slotor recess.

Positioned on top of plate, 25, around the .upper portion of stem, 15,is an auxiliary plate, 35, that is carried by stem, 15, in any suitablemanner, and screw seated upon the threaded portion of member, 16, is anut, 36, the under side of which bears directly on top of plate, 35,thus holding the various movable parts of the valve in proper assembledrelation.

In the operation of my improved valve it is only necessary to engage theangular upper end, 17, of the stem with a suitable handle or tool androtate the plug, 13, so as to open or close the passageway through thehousing, 10, or into position to control the flow of fluid through saidhousing. At all times the resilient member, 32, exerts constant pressureon the inner portion of the diaphragm to maintain a fluid tight jointbetween the plug and the plate, 25, and which latter serves as a closurefor the end of the valve housing and retains the plug in properoperative position within said housing.

While the improvements herein set out are shown and described inconnection with a plug cock in which the plug is rotatably held in theplug seat against vertical movement by a plate secured to the body ofthe cock which takes the thrust and prevents forcing the plug in theplug seat, it is obvious that these improvements are equally applicableto any plug cock which is arranged with lubricant passages whichterminate against two seated valves, namely, the plug against the plugseat on the one end and the check valve against its seat on the otherend, the same purposes being served by the invention whether the plug beseated upwardly with the large diameter of the taper at the bottom ordownwardly with the small diameter of the taper at the bottom as whenthe cock is set in normal operating position in a pipe line, as shown inFig. 1.

It will be readily understood that minor changes in the size, form andconstruction of the various parts entering into my improvements may bemade and substituted for those herein shown and described withoutdeparting from the spirit of the invention.

\Vhat I claim is 1. In a plug cock, a plug, a plug seat, 2

said inlet.

2. In a plug cock, a casing having a plug seat. a plate affixed to thecasing, a dia-- pln'agm between the plate and the casing, a plug seatedin the casing and rotatably and adjustably held by the plate againstvertical movement and resilient means for seating the diaphragm againstthe plug, lubricant passages between the plug and plug seat surfaces. alubricant filling inlet communi eating with said passages and a checkvalve in the filling inlet.

3. In a plug cock, a casing having a plug seat, a plate aflixed to thecasing, a dia phragm between the plate and the casing, a plug seated inthe casing and rotatably held by the plate against verticalmovement, ajoint ring between the diaphragm and the end of the plug and resilientmeans for seating the diaphragm against the ring.

4. In a plug cock, a casing having a plug seat, a plate aflixed to thecasing, a diaphragm between the plate and the casing a plug seated inthe casing and rotatably and adjustably held by the plate againstvertical movement, a joint ring between the diaphragm and the end of theplug and resilient means for seating the diaphragm against the ring.

5. In a plug cock, a casing having a plug seat, a plate aflixed to thecasing, :1 diaphragm between the plate and the casing, a plug seated inthe casing and rotatably held by the plate against vertical movement, ajoint ring between the diaphragm and the end of the plug, resilientmeans for seating the diaphragm against the ring, lubricant passagesbetween the plug and plug seatsurfaces, a lubricant filling inletcommunicating with said passages and a check valve in the filling inlet.

JESSE C. MARTIN, JR. l/Vitnesses:

W. W. HEALEY, T. D. GARLIcHs.

